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73 lines
2.3 KiB
Markdown
73 lines
2.3 KiB
Markdown
## MinIO Healthcheck
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MinIO server exposes three un-authenticated, healthcheck endpoints liveness probe, readiness probe and a cluster probe at `/minio/health/live`, `/minio/health/ready` and `/minio/health/cluster` respectively.
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### Liveness probe
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This probe always responds with '200 OK'. When liveness probe fails, Kubernetes like platforms restart the container.
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```
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livenessProbe:
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httpGet:
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path: /minio/health/live
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port: 9000
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scheme: HTTP
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initialDelaySeconds: 3
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periodSeconds: 1
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timeoutSeconds: 1
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successThreshold: 1
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failureThreshold: 3
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```
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### Readiness probe
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This probe always responds with '200 OK'. When readiness probe fails, Kubernetes like platforms *do not* forward traffic to a pod.
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```
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readinessProbe:
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httpGet:
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path: /minio/health/ready
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port: 9000
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scheme: HTTP
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initialDelaySeconds: 3
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periodSeconds: 1
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timeoutSeconds: 1
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successThreshold: 1
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failureThreshold: 3
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```
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### Cluster probe
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This probe is not useful in almost all cases, this is meant for administrators to see if quorum is available in any given cluster. The reply is '200 OK' if cluster has quorum if not it returns '503 Service Unavailable'.
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```
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curl http://minio1:9001/minio/health/cluster
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HTTP/1.1 503 Service Unavailable
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Accept-Ranges: bytes
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Content-Length: 0
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Content-Security-Policy: block-all-mixed-content
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Server: MinIO/GOGET.GOGET
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Vary: Origin
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X-Amz-Bucket-Region: us-east-1
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X-Amz-Request-Id: 16239D6AB80EBECF
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X-Xss-Protection: 1; mode=block
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Date: Tue, 21 Jul 2020 00:36:14 GMT
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```
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#### Checking cluster health for maintenance
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You may query the cluster probe endpoint to check if the node which received the request can be taken down for maintenance, if the server replies back '412 Precondition Failed' this means you will lose HA. '200 OK' means you are okay to proceed.
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```
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curl http://minio1:9001/minio/health/cluster?maintenance=true
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HTTP/1.1 412 Precondition Failed
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Accept-Ranges: bytes
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Content-Length: 0
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Content-Security-Policy: block-all-mixed-content
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Server: MinIO/GOGET.GOGET
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Vary: Origin
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X-Amz-Bucket-Region: us-east-1
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X-Amz-Request-Id: 16239D63820C6E76
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X-Xss-Protection: 1; mode=block
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Date: Tue, 21 Jul 2020 00:35:43 GMT
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```
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